将 .Net RSA xml 密钥移植到 Java [英] Porting .Net RSA xml keys to Java

问题描述

我有来自 .Net 系统的 xml 格式的私钥和公钥.我必须使用此密钥在 Java 中执行加密/解密.有什么办法吗?

I have private and public keys from the .Net system in the xml format. I have to use this keys to perform encryption/decryption in Java. Is there any way to do it?

公钥看起来像这样:

<RSAKeyValue>
    <Modulus>jHIxcGzzpByFv...pvhxFnP0ssmlBfMALis</Modulus>
    <Exponent>AQAB</Exponent>
</RSAKeyValue>

私钥:

<RSAKeyValue>
    <Modulus>4hjg1ibWXHIlH...ssmlBfMAListzrgk=</Modulus>
    <Exponent>AQAB</Exponent>
    <P>8QZCtrmJcr9uW7VRex+diH...jLHV5StmuBs1+vZZAQ==</P>
    <Q>8CUvJTv...yeDszMWNCQ==</Q>
    <DP>elh2Nv...cygE3657AQ==</DP>
    <DQ>MBUh5XC...+PfiMfX0EQ==</DQ>
    <InverseQ>oxvsj4WCbQ....LyjggXg==</InverseQ>
    <D>KrhmqzAVasx...uxQ5VGZmZ6yOAE=</D>
</RSAKeyValue>

我写了一些代码来加密数据，但我不确定它是否正确.

I have written a bit of code to encrypt data but I am not sure if its correct.

        Element modulusElem = root.getChild("Modulus");
        Element exponentElem = root.getChild("Exponent");

        byte[] expBytes = decoder.decodeBuffer(exponentElem.getText().trim());
        byte[] modBytes = decoder.decodeBuffer(modulusElem.getText().trim());

        RSAPublicKeySpec keySpec = new RSAPublicKeySpec(new BigInteger(1, modBytes), new BigInteger(1, expBytes));
        KeyFactory fact = KeyFactory.getInstance("RSA");
        PublicKey pubKey = fact.generatePublic(keySpec);

如何从xml中生成私钥来解密数据?

How can I make a private key from the xml to decrypt the data?

推荐答案

在您的示例中是 decoder 进行 Base64 解码吗?看起来您可能依赖 sun.misc.BASE64Decoder 并且依赖这些内部类通常不是一个好主意(例如其他 JVM 不会有它).您可以使用 Apache Commons Codec ，它有一个 Base64 类来解码.以下是 RSA 加密和解密所需的其余内容:

Is that decoder in your example doing the Base64 decoding? It looks like you might be relying on sun.misc.BASE64Decoder and it's generally not a good idea to depend on those internal classes (other JVM's won't have it for instance). You could use Apache Commons Codec that has a Base64 class to decode with. Here's the rest of what you need though for RSA encryption and decryption:

byte[] expBytes = Base64.decodeBase64(exponentElem.getText().trim()));
byte[] modBytes = Base64.decodeBase64(modulusElem.getText().trim());
byte[] dBytes = Base64.decodeBase64(dElem.getText().trim());

BigInteger modules = new BigInteger(1, modBytes);
BigInteger exponent = new BigInteger(1, expBytes);
BigInteger d = new BigInteger(1, dBytes);

KeyFactory factory = KeyFactory.getInstance("RSA");
Cipher cipher = Cipher.getInstance("RSA");
String input = "test";

RSAPublicKeySpec pubSpec = new RSAPublicKeySpec(modules, exponent);
PublicKey pubKey = factory.generatePublic(pubSpec);
cipher.init(Cipher.ENCRYPT_MODE, pubKey);
byte[] encrypted = cipher.doFinal(input.getBytes("UTF-8"));
System.out.println("encrypted: " + new String(encrypted));

RSAPrivateKeySpec privSpec = new RSAPrivateKeySpec(modules, d);
PrivateKey privKey = factory.generatePrivate(privSpec);
cipher.init(Cipher.DECRYPT_MODE, privKey);
byte[] decrypted = cipher.doFinal(encrypted);
System.out.println("decrypted: " + new String(decrypted));

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